Nima Sheyad

October 29, 2002 10:05 
Boundary codition for multiphase
Hi everybody I'm trying to simulate a two phase flow. The problem is condensation of a turbulent annular film of R22 vapor in a tube. I've used Fluent 5.23 to solve the problem but I haven't known how to enter some boundary conditions. The VOF two multiphase model has used for simulating the case. The turbulent model is standard kepsilon .The coordinate system is cylindrical. At flow inlet, the velocity of vapor core is different from velocity of liquid film. The boundary condition is: U = Uin,v if 0 < r < R  d U = Uin,l if R  d < r < R "d" is liquid film thickness. At flow outlet I have to enter (dk/dz) =0 and (d epsilon/dz) =0. Please help me in this regard. Your kind attention and your prompt reply would be highly appreciated. Yours Faithfully Nima Sheyad
